家雀一直以来都在被人类深入研究，基因测试表明，它们的幼崽约有四分之一来自配偶以外的其它雄性。
Among barn swallows, that have been extensively studied, about a quarter of the nestlings were sired by a male other than the mate, according to genetic tests.
对人类语言差异的深入研究有助于人们真正理解文化之间的认知差异。
An in-depth study of differences between human languages contributes to a true understanding of cognitive differences between cultures.
随着科学家们对我们的基因进行更深入的研究，他们在过去的几千年里就发现了人类进化的例子。
As scientists look deeper into our genes, they are finding examples of human evolution in just the past few thousand years.
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